Azure na region added

Author: uttamukkoji

index.d.ts

@@ -21,7 +21,8 @@ export class Utils {
 //Enum for Contentstack Region
 export enum Region {
     US = "us",
-    EU = "eu"
+    EU = "eu",
+    AZURE_NA = "azure-na"
 }
 
 //Enum for Contentstack CachePolicy

src/core/contentstackregion.js

@@ -1,6 +1,7 @@
 const ContentstackRegion = {
     EU: "eu",
-    US: "us"
+    US: "us",
+    AZURE_NA: "azure-na"
 };
 
 export default ContentstackRegion;

test/typescript/stack.test.ts

@@ -130,6 +130,41 @@ describe('Stack tests', () => {
         done();
     });
 
+    test('Stack initialization with Contentstack Config with fetchOptions, Azure-NA region test', done => {
+        const config : Contentstack.Config = {
+            api_key: 'api_key', 
+            delivery_token: 'delivery_token', 
+            environment: 'environment',
+            region: Contentstack.Region.AZURE_NA,
+            fetchOptions:{
+                timeout: 2000,
+                retryLimit: 4,
+                retryDelay: 40
+            }
+        };
+        const stack = Contentstack.Stack(config);
+        
+        expect(stack.cachePolicy).toEqual(Contentstack.CachePolicy.IGNORE_CACHE);
+        expect(stack.environment).toEqual('environment');
+        expect(stack.config.host).toEqual('azure-na-cdn.contentstack.com');
+        expect(stack.config.port).toEqual(443);
+        expect(stack.config.version).toEqual("v3");
+        expect(stack.fetchOptions.timeout).toEqual(2000);
+        expect(stack.fetchOptions.retryLimit).toEqual(4);
+        expect(stack.fetchOptions.retryDelay).toEqual(40);
+        done();
+    });
+    
+    test('Stack initialization with region EU test', done => {
+        const stack = Contentstack.Stack('api_key', 'delivery_token', 'environment', Contentstack.Region.AZURE_NA);
+        expect(stack.cachePolicy).toEqual(Contentstack.CachePolicy.IGNORE_CACHE);
+        expect(stack.environment).toEqual('environment');
+        expect(stack.config.host).toEqual('azure-na-cdn.contentstack.com');
+        expect(stack.config.port).toEqual(443);
+        expect(stack.config.version).toEqual("v3");
+        done();
+    });
+
     test('Stack initialization with region EU and fetchOptions test', done => {
         const stack = Contentstack.Stack('api_key', 'delivery_token', 'environment', Contentstack.Region.EU, {
             timeout: 2000